With the development of economy and science and technology, the standard of social life is increasing, and people pay more and more attention to environmental protection and health issues. Due to the serious secondary pollution of drinking water quality, many urban residents have high expectations for safer drinking water. At the same time, in some developed urban areas of China, the water supply project and the drinking water project are also under a small area. The pilot was converted to a large-scale implementation. Based on this situation, the demand for energy-saving, safe, environmentally friendly and sanitary water supply pipes in China is growing rapidly.

Due to the restrictions on the cost of building installation and the development and application of pipeline technology, the galvanized iron pipe has been used for many years in China. The galvanized iron pipe has rust problems, which will cause secondary pollution of drinking water. After the 1990s, China's pipeline industry has successively developed new plastic pipes such as PE-X, PP-R, PB and CPVC aluminum-plastic composite pipes. Its advantages of light weight, energy saving and environmental protection have been rapidly promoted in the construction pipeline market.

However, the lack of hygienic safety of ordinary plastic water supply pipes is very obvious. When PE-X, PP-R, CPVC and other water pipes are used for more than one month, the inner wall will slip and stick, which is the result of fungal growth. The resulting pollution of drinking water is insurmountable in such pipelines. At the same time, there are still many projects in China that have imported pure stainless steel pipes from Japan, France, South Korea, etc., but the stainless steel pipes have rough inner walls, high conveying resistance, high energy consumption, easy scaling, bacteria and microorganisms, and stainless steel. Easy to precipitate heavy metals will also pollute the water quality, and the secondary treatment cost of water is high. According to the statistics of the World Health Organization, about 60% of the diseases are transmitted through drinking water. With the media water supply project and the further promotion and deepening of the drinking water project, the construction industry in China is non-toxic, antibacterial, antibacterial and resistant to health. The demand for corroded new pipes has surged. In this case, a new type of water supply pipe - antibacterial steel-plastic composite pipe came into being. The outer layer of the pipe is an ultra-thin stainless steel welded pipe with a thickness of 0.25-0.4mm, which gives the pipe flame retardant, compressive and high-strength performance. The inner wall of the plastic uses the internationally advanced molecular assembly antibacterial developed by East China University of Science and Technology. The technology not only ensures the safety of drinking water, but also ensures the durability of the antibacterial effect. This kind of pipe takes into account the advantages of plastic pipe and metal pipe, and is much lower than the metal pipe such as stainless steel and copper pipe in cost cost, even lower than the currently used galvanized plastic pipe, which has great market potential. At present, the comprehensive performance of the pipeline is unique in drinking water from the water supply pipeline.

Since the pipe is made of steel and plastic, and the inner wall of the plastic is treated with antibacterial treatment, its production process has many unique features. First of all, in the molding and welding technology, the production process of stainless steel decorative tubes produced in large quantities in China is based on the internal pressure wheel preforming method. This technology can only produce stainless steel tubes with a thickness of 0.4mm or more, and the inner layer cannot be joined simultaneously. Plastic layer. The key to the molding technology of the antibacterial steel-plastic composite pipe is to use the outer molding die, the plastic pipe as the inner core, the synchronously forming the stainless steel pipe and the inner plastic pipe, and the 0.25 mm stainless steel belt can be smoothly formed, and the welding technology adopts the most advanced micro beam in foreign countries. Plasma welding not only makes the weld evenly continuous, but also does not cause damage to the inner layer of the plastic.

Secondly, in order to avoid the phenomenon of inner layer retraction due to different shrinkage rates, the technology adopts a modified high-strength hot-melt adhesive, and through the composite molding process, the plastic pipe pre-coated with hot-melt adhesive is drawn into the plastic pipe. Inside the metal tube being welded. At this time, there is a microscopic gap between the plastic pipe and the metal pipe, which can ensure that the high temperature of the welding point does not damage the inner wall plastic pipe, and then enters the shrinking machine mold online, and the metal pipe is tightly pressed into the inner through the compression die. An interference fit is formed on the plastic tube. At the same time, the metal tube is continuously heated at a high frequency, so that the hot melt adhesive is evenly filled between the metal tube and the plastic tube, and the ideal bonding state is achieved.

Furthermore, the inner layer of the antibacterial copper-plastic composite pipe plastic adopts a new technology of molecular assembly and antibacterial. It assembles the preferred organic antibacterial functional group onto the molecular chain of the polyethylene matrix resin. Since the antibacterial functional group is attached to the resin in the form of a chemical bond, it overcomes the heat resistance of the common organic antibacterial agent and polyethylene. The matrix has poor compatibility, is not resistant to immersion washing, and is broadly efficient, safe and non-toxic. Long-lasting effects, thermal stability, compatibility with resins, and processability are unmatched by current anti-bacterial functional materials at home and abroad. The access of the antibacterial agent is realized by a specially designed multi-functional rendezvous extrusion processing head mold, which consists of three parts, namely an inner layer plastic extrusion mold, a hot melt adhesive extrusion mold and an antibacterial layer extrusion. Out of the mold, this advanced compound extrusion process can form a solid and even antibacterial film on the inner wall of the pipe, so that the antibacterial material can maximize the effectiveness in the product, while reducing the amount of antibacterial agent and reducing the cost of the product.

The antibacterial steel-plastic composite pipe production technology was successfully developed by Qingdao University of Science and Technology. After two years of research and development work, the project has made breakthrough progress and has been industrialized in Foshan Aipex Environmental Protection Technology Co., Ltd. The launch of this new product will provide a strong guarantee for improving the safety of drinking water in China.

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